JP2010060021A - One-way clutch and pulley unit with the same built therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of noise in a ratchet type one-way clutch. <P>SOLUTION: In this one-way clutch 10, plate parts 14c, 15c having engaging faces 14e, 15e axially opposing an outer member and an inner member are provided, an engaging piece 17 is provided to one of the plate parts 14c, 15c, a tip end 17a side of the engaging piece 17 is biased from one plate part 15c toward the other plate part 14c, and an engaging recessed part 18 capable of engaging with the tip end 17a side of the engaging piece 17 when the tip end 17a side of the engaging piece 17 is projected to the other plate part 14c side from the one plate part 15c by the biasing is provided on the engaging face 14e of the other plate part 14c. An auxiliary elastic member 30 for biasing the engaging piece 17 toward the one plate part 15c is provided between the engaging recessed part 18 and the engaging piece 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a one-way clutch that transmits and interrupts rotational torque, and a one-way clutch built-in pulley unit that incorporates the one-way clutch.

  For example, a one-way clutch is used to transmit and block rotational torque in various power transmission paths such as an accessory drive device that transmits the rotation of a crankshaft of an engine of an automobile or the like to various accessories via a belt. Incorporated.

  This type of one-way clutch connects the input side and the output side when the angular speed of rotation on the input side increases, and transmits the rotation on the input side to the output side. Is released to interrupt transmission of rotational torque from the input side to the output side.

  As an example of a one-way clutch, for example, as shown in Patent Document 1, a large number of engagement elements are provided in a space between an inner peripheral surface of an outer member (outer ring) and an outer peripheral surface of an inner member (inner ring). Sprag type and roller type one-way clutches incorporating sprags and rollers are known.

  As an example of a one-way clutch incorporated in an automatic transmission, as shown in FIG. 4, an engagement plate that can move in the axial direction exerts a ratchet function so that an input side plate and an output side plate can be connected to each other. Some can be combined and uncoupled.

  In the one-way clutch 20, the input side member 24 and the output side member 25 are provided with engagement surfaces 24e and 25e that are opposed to each other in the axial direction, and the input side member 24 or the output side between the engagement surfaces 24e and 25e. The engaging piece 27 is provided on one side of the member 25, and the engaging recess 24a into which the engaging piece 27 can enter is provided on the other side.

  The engagement piece 27 is provided in an accommodation recess 25a formed in the engagement surface 25e, and is urged toward the engagement surface 24e by an elastic member 26 disposed in a bottom portion 25a ′ of the accommodation recess 25a. Yes.

  When the input side member 24 rotates relative to the output side member 25 in the direction of the arrow b in the figure, the engagement piece 27 enters the engagement recess 24a, thereby coupling the input side member and the output side member. When the input side member 24 rotates relative to the output side member 25 in the direction opposite to the arrow b, the engagement piece 27 is released from the engagement recess 24a, thereby releasing the coupling. (For example, refer to Patent Document 2).

JP 2001-187931 A JP 2000-97255 A

  In the one-way clutch described in Patent Document 1 in which the engagement element is disposed in the space between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring, the axial length of the engagement element is set to ensure sufficient torque capacity. There is a problem that it must be lengthened. Since the one-way clutch is required to be thin, it is not preferable that the axial length of the engagement element becomes long.

  In that respect, in the ratchet type one-way clutch 20 shown in Patent Document 2, the ratchet function is exhibited by an engagement piece movable in the axial direction, so that the axial length of the entire clutch is shortened. .

  However, in the one-way clutch 20, the engagement piece for exhibiting the ratchet function collides with the bottom surface of the engagement recess provided in the opposite plate particularly during idling. For this reason, abnormal noise may occur during the collision, which may be undesirable.

  Accordingly, an object of the present invention is to suppress the generation of abnormal noise in a ratchet one-way clutch.

  In order to solve the above-described problems, the present invention provides a plate portion having engagement surfaces facing each other in the axial direction on an outer member and an inner member arranged coaxially, and one of the plate portions. An engagement piece is provided on the plate, and the engagement piece is urged from one plate portion to the other plate portion by an elastic member, and the engagement surface of the other plate portion is urged by the urge. An engagement recess is provided in which the engagement piece can enter when the engagement piece protrudes from the one plate portion to the other plate portion side, and the outer member and the inner member are When the relative rotation in one direction around the shaft is performed, the engaging piece is engaged with the engaging recess to couple the outer member and the inner member, and the outer member and the inner member are pivoted. When the relative rotation around the other direction, the engagement piece is detached from the engagement recess The engagement is released, and an auxiliary elastic member that biases the engagement piece toward one of the plate portions is provided between the engagement recess and the engagement piece. It was adopted.

According to this configuration, when the engagement piece tries to collide with the bottom surface of the engagement recess by the urging force of the elastic member, the auxiliary elastic member pushes the engagement piece back toward the one plate portion.
For this reason, generation | occurrence | production of unusual noise can be suppressed.

  The auxiliary elastic member may be fixed to the engagement piece side, but is preferably fixed in the engagement recess. This is because when the auxiliary elastic member is fixed to the engagement piece, the auxiliary elastic member slides on the engagement surface of the other plate portion in which the engagement concave portion is formed during idling.

  In addition, when the auxiliary elastic member is fixed in the engaging recess, for the same purpose as described above, the auxiliary elastic member does not hit the engaging piece in a state where the engaging piece is detached from the engaging recess. The set configuration can be adopted. This is because it is possible to prevent the auxiliary elastic member from sliding on the engagement surface of the one plate portion provided with the engagement piece during idling.

Furthermore, the auxiliary elastic member may employ a configuration having an elastic force that does not allow the engagement piece to contact the bottom surface of the engagement recess.
By making the elastic force of the auxiliary elastic member strong enough that the engagement piece does not hit the bottom surface of the engagement recess, the generation of abnormal noise can be completely suppressed. Note that the elastic force of the auxiliary elastic member may be a strength that allows the contact of the engagement piece to the bottom surface of the engagement recess as long as the generation of abnormal noise is permitted.

  Moreover, the structure by which the elastic force of the said auxiliary | assistant elastic member is set smaller than the elastic force of the said elastic member is employable. In this way, the urging | biasing to the said engagement direction of the engagement piece by an elastic member is not inhibited.

In each of these configurations, the auxiliary elastic member may be configured to be stored in a storage hole provided in the engagement recess.
Since the bottom surface of the engaging recess and the outer surface of the engaging piece facing the engaging recess are in a state in which the engaging piece enters the engaging recess, the gap is very small or in contact with each other. Space for arranging members is small. For this reason, by providing the storage hole, it is possible to secure a space for arranging the auxiliary elastic member having a sufficient necessary elastic force.

As the auxiliary elastic member, for example, a coil spring can be employed. A leaf spring may be employed.
Further, when the auxiliary elastic member is stored in the storage hole, the shape and size of both can be set so that the auxiliary elastic member can be press-fitted and fixed in the storage hole.

The fixing method between the plate part and the outer member and the inner member is not particularly limited. For example, the plate part on the outer member side is formed integrally with the outer member. Alternatively, a member formed separately from the outer member may be fixed by a known method such as press-fitting or bonding so that the two can be integrally rotated.
The same applies to the plate portion on the inner member side, and it may be formed integrally with the inner member, or the member formed separately from the inner member can be rotated together. For example, it may be fixed by a well-known method such as press-fitting or adhesion so as to achieve a proper state.

  A pulley with a built-in one-way clutch used in an accessory driving device that transmits the rotation of the crankshaft of the engine to various accessories through a belt has a built-in one-way clutch composed of these components. be able to.

  In the one-way clutch built in the one-way clutch built-in pulley, the outer member is a pulley, the inner member is an inner shaft, and the plate portion on the outer member side is radially inward from the pulley. The one-way clutch built-in pulley unit is provided so as to stand up, and the plate portion on the inner member side is provided so as to stand up radially outward from the inner shaft and incorporates the one-way clutch.

  In this invention, when the engagement piece tries to collide with the bottom surface of the engagement recess by the urging force of the elastic member, the auxiliary elastic member pushes the engagement piece back to the one plate portion side. Can be suppressed.

  An embodiment of the present invention will be described with reference to FIGS. This embodiment is a pulley unit with a built-in one-way clutch in which a one-way clutch 10 having a ratchet mechanism is built in between a pulley 7 and an inner shaft 12 arranged on the same axis. In this embodiment, the pulley 7 is on the input side and the inner shaft 12 is on the output side.

  As shown in FIG. 1, the input side member 14 and the output side member 15 are arranged between the pulley 7 and the inner shaft 12.

  The input side member 14 is press-fitted and fixed to the inner periphery of the pulley 7 and has cylindrical outer peripheral portions 14 a and 14 b that rotate integrally with the pulley 7, and radially inward from the center in the axial direction of the outer peripheral portions 14 a and 14 b. And an outer plate portion 14c that rises.

  The outer diameter surfaces of the outer peripheral portions 14a and 14b are press-fitted and fixed to the inner diameter surface 7a of the pulley 7 over the entire circumference, and the outer peripheral portions 14a and 14b and the outer plate portion 14c are fixed to the pulley 7 by the press-fitting and fixing. And rotate together.

  The output side member 15 includes a cylindrical base portion 15b that is press-fitted and fixed to the outer periphery of the inner shaft 12 and rotates integrally with the inner shaft 12, and an inner plate portion 15c that rises radially outward from an axial end portion of the base portion 15b. And.

  The inner diameter surface of the base portion 15b is press-fitted and fixed to the outer diameter surface 12a of the inner shaft 12 over the entire circumference, and the base portion 15b and the inner plate portion 15c rotate integrally with the inner shaft 12 by the press-fitting and fixing. It is supposed to be.

  As shown in FIG. 1, an engagement surface 14e facing the inner plate portion 15c of the output side member 15 is provided on the outer plate portion 14c on the input side member 14 side. The surface direction of the engagement surface 14e is an axis orthogonal direction.

  Similarly, the inner plate portion 15c on the output side member 15 side is provided with an engagement surface 15e facing the outer plate portion 14c side of the input side member 14, as shown in FIG. The surface direction of the engagement surface 15e is a direction perpendicular to the axis, and is in surface contact with the engagement surface 14e on the side of the outer plate portion 14c and is opposed in a slidable state.

Note that a gap is provided between the outer diameter surface 15f of the inner plate portion 15c and the inner diameter surface 14d of the outer peripheral portion 14b, and the seal portion 8 is provided in the clearance over the entire circumference.
Further, a gap is also provided between the inner diameter surface 14g of the outer plate portion 14c and the outer diameter surface 12a of the inner shaft 12, and the seal portion 9 is provided in the gap over the entire circumference.

  The seal portions 8 and 9 can hold the lubricant sealed between the engagement surfaces 14e and 15e.

The pulley 7 and the inner shaft 12 are supported by a first bearing portion 11 and a second bearing portion 13 provided on both sides in the axial direction so as to be relatively rotatable about the axis.
In the present embodiment, the first bearing portion 11 and the second bearing portion 13 each employ a ball bearing with a single seal. The seal is assembled so as to be positioned outside in the axial direction.

The first bearing portion 11 shown on the right side in FIG. 1 is press-fitted and fixed between the inner diameter surface 14 f of the outer peripheral portion 14 a and the outer diameter surface 12 a of the inner shaft 12.
That is, the first bearing portion 11 includes a bearing inner ring 11b fixed so as to be rotatable integrally with the inner shaft 12, a bearing outer ring 11a fixed so as to be rotatable integrally with the input side member 14, and the bearing inner ring 11b and the bearing. A ball (rolling element) 11c is provided between the outer ring 11a and the outer ring 11a. The ball 11c is housed in a raceway groove provided in the bearing inner ring 11b and the bearing outer ring 11a, and is freely rollable.

1 is press-fitted and fixed between the inner diameter surface 7a of the pulley 7 and the outer diameter surface 15d of the base portion 15b.
That is, the second bearing portion 13 includes a bearing inner ring 13b fixed so as to be rotatable integrally with the output side member 15, a bearing outer ring 13a fixed so as to be rotatable integrally with the pulley 7, and the bearing inner ring 13b and the bearing outer ring. A ball (rolling element) 13c housed between 13a and 13a is provided. The ball 13c is housed in a raceway groove provided in the bearing inner ring 13b and the bearing outer ring 13a and is freely rollable.

  Further, the inner plate portion 15c is provided with a recess 15a in the engagement surface 15e. A plate-like engagement piece 17 is accommodated in the recess 15a. As shown in FIG. 2, the engaging piece 17 is urged toward the opposite outer plate portion 14c by the elastic member 16 accommodated in the bottom portion 15a 'of the concave portion 15a.

  In this embodiment, the elastic member 16 uses a torsion coil spring having protruding portions 16a and 16b at both ends of the coil spring portion 16c. One of the protruding portions 16a and 16b is related to the bottom portion 15a 'and the other is related to the other. It hits the piece 17.

  As shown in FIG. 2 (b), when the elastic member 16 is deformed in a direction in which the two protruding portions 16a and 16b approach each other, the opposite direction to the approaching direction (the two protruding portions 16a and 16b). An elastic force acts (in a direction away from each other), and the elastic force biases the distal end 17a side of the engagement piece 17 as shown in FIG.

  Further, when the engagement piece 17 protrudes from the engagement surface 15e of the inner plate portion 15c toward the outer plate portion 14c by the biasing, the engagement surface 14e of the outer plate portion 14c An engagement concave portion 18 into which the engagement piece 17 can enter is provided.

As shown in FIG. 3, the engaging recess 18 is provided at a plurality of locations along the circumferential direction on the engaging surface 14e of the outer plate portion 14c. Since the number of the engagement recesses 18 can be freely set, for example, it can be set at four locations, six locations, or eight locations along the circumferential direction.
In this embodiment, the engagement piece 17 is provided at one place as a whole. However, if the engagement piece 17 is damaged, as a backup at the time of the damage, for example, along the circumferential direction. Three or five engagement pieces 17 may be arranged. However, it is desirable that the number of the engagement recesses 18 is larger than the number of the engagement pieces 17.

  Each engaging recess 18 has the same shape and size, and is provided in an equally divided direction along the circumferential direction. Further, the bottom surface 19 of each engagement recess 18 is provided at an inclined portion 18c that gradually becomes deeper from one side to the other side along the circumferential direction, and an end portion on the other side of the inclined portion 18c. And a deep groove portion 18a formed so as to slightly drop from the other end portion of the inclined portion 18c.

  A storage hole 31 is formed in the inclined portion 18 c of the engaging recess 18. An auxiliary elastic member 30 made of a coil spring is accommodated in the accommodation hole 31. One end of the auxiliary elastic member 30 is press-fitted and fixed in the storage hole 31.

Hereinafter, an operation when the pulley 7 as the input side relatively rotates around the axis with respect to the inner shaft 12 as the output side will be described.
When the input side member 14 and the output side member 15 are relatively rotated in one direction around the axis, for example, as indicated by an arrow A in FIG. Assume a case of rotation.

  When the input side member 14 rotates relative to the output side member 15 in the direction indicated by the arrow A in FIG. 2A, the engagement is performed when the engagement recess 18 faces the side of the engagement piece 17. The piece 17 is pushed to the right side in the figure by the urging force of the elastic member 16 with the rear end 17b side as a fulcrum. As a result, the engagement piece 17 enters the engagement recess 18.

When the engagement piece 17 enters the engagement recess 18, the tip 17 a engages with the end wall 18 b of the engagement recess 18.
By this engagement, the input side member 14 and the output side member 15 are coupled, and the input side member 14 and the output side member 15 are rotated together (engaged state). That is, the rotational force applied to the pulley 7 is transmitted to the inner shaft 12.

Further, from the state shown in FIG. 2A, when the input side member 14 rotates relative to the output side member 15 in the direction indicated by the arrow C in FIG. Then, it is pushed out to the left in the figure by the inclined portion 18c of the engaging recess 18. That is, the engagement piece 17 is pushed to the left side in the figure against the urging force of the elastic member 16 with the rear end 17b side as a fulcrum.
This extrusion gradually proceeds as the circumferential phase of the engagement piece 17 and the engagement recess 18 shifts, and at the position shown in FIG. Leave.

When the engagement piece 17 is disengaged from the engagement recess 18, the engagement between the tip 17 a and the end wall 18 b of the engagement recess 18 is released.
By this disengagement, the connection between the input side member 14 and the output side member 15 is also eliminated, and the input side member 14 and the output side member 15 are idled (idle state). That is, the rotational force applied to the pulley 7 is not transmitted to the inner shaft 12.

In this idling state, the engagement piece 17 is always urged toward the outer plate portion 14 at the front end 17a side, and is not directly urged at the rear end 17b side. That is, the engagement piece 17 is urged to rotate around the corner portion 17d of the rear end 17b.
For this reason, every time the engagement recess 18 appears on the side of the engagement piece 17, the tip 17 a of the engagement piece 17 enters the engagement recess 18, and the engagement recess 18 is located on the side of the engagement piece 17. If it is withdrawn, the tip 17a of the engagement piece 17 repeats the operation of disengaging from the engagement recess 18.

  In repetition of this movement, when the engaging piece 17 tries to collide with the bottom surface 19 of the engaging recess 18 by the biasing force of the elastic member 16 due to the interposition of the auxiliary elastic member 30, the auxiliary elastic member 30 is engaged. It acts to push the joining piece 17 back toward the inner plate portion 15c. For this reason, the noise generated when the engagement piece 17 collides with the bottom surface 19 can be suppressed.

In this embodiment, as shown in FIG. 2A, when the engagement piece 17 completely enters and engages in the engagement recess 18, the outer surface 17c of the engagement piece 17 is the bottom surface. The elastic force of the elastic member 16 and the auxiliary elastic member 30 is set so as not to hit 19.
Further, since the elastic force of the auxiliary elastic member 30 is set to be smaller than the elastic force of the elastic member 16, the elastic member 16 does not hinder the urging of the engagement piece 17 in the engagement direction.

  In these embodiments, by providing the seal portions 8 and 9, the lubricant is easily held in the space between the engagement surfaces 14e and 15e. For this reason, the lubrication between the engagement piece 17 and the engagement recess 18 is efficiently ensured, and the generation of abnormal noise is further effectively suppressed and the wear of the member is also prevented.

  In the case where the pulley 7 is on the output side and the inner shaft 12 is on the input side, the relationship is opposite to the above-described action. This point will be described below. The right side indicated by reference numeral 14 in FIG. Assuming that the member is an output side member and the left side member indicated by reference numeral 15 is an input side member, when the input side member rotates relative to the output side member in the direction indicated by arrow B in FIG. When the engagement piece 17 faces the side of the engagement recess 18, the engagement piece 17 is pushed to the right side in the figure by the urging force of the elastic member 16 with the rear end 17 b side as a fulcrum. It is. As a result, the engagement piece 17 enters the engagement recess 18.

When the engagement piece 17 enters the engagement recess 18, the tip 17 a engages with the end wall 18 b of the engagement recess 18.
By this engagement, the input side member 14 and the output side member 15 are coupled, and the input side member 14 and the output side member 15 are rotated together (engaged state). That is, the rotational force applied to the inner shaft 12 is transmitted to the pulley 7.

When the input side member rotates relative to the output side member in the direction indicated by the arrow D in FIG. 2B from the state shown in FIG. 2A, the outer surface 17c of the engagement piece 17 is engaged. It is pushed out to the left in the figure by the inclined portion 18c of the combined recess 18. That is, the engagement piece 17 is pushed to the left side in the figure against the urging force of the elastic member 16 with the rear end 17b side as a fulcrum.
This extrusion gradually proceeds as the circumferential phase of the engagement piece 17 and the engagement recess 18 shifts, and at the position shown in FIG. Leave.

When the engagement piece 17 is disengaged from the engagement recess 18, the engagement between the tip 17 a and the end wall 18 b of the engagement recess 18 is released.
By this disengagement, the connection between the input side member 14 and the output side member 15 is also eliminated, and the input side member 14 and the output side member 15 are idled (idle state). That is, the rotational force applied to the inner shaft 12 is not transmitted to the pulley 7.

  Even in the configuration of the one-way clutch 10 in which the output side and the input side are reversed, the operation of the auxiliary elastic member 30 is the same, and thus the description thereof is omitted.

  In these embodiments, the engagement concave portion 18 is provided in the outer plate portion 14c, and the engagement piece 17 and the concave portion 15a for accommodating the engagement piece 17 are provided in the inner plate portion 15, but conversely, the inner plate portion. The engagement recess 18 may be provided in 15c, and the engagement piece 17 and the recess 15a for accommodating it may be provided in the outer plate portion 14.

In these embodiments, the auxiliary elastic member 30 is accommodated in the accommodation hole 31 provided in the inclined portion 18c of the engagement recess 18, but the present invention is not limited to this configuration, and the auxiliary elastic member 30 is engaged. The arrangement position and the fixing method in the recessed part 18 are free. For this reason, for example, the auxiliary elastic member 30 may be fixed in the deep groove portion 18a.
Alternatively, the auxiliary elastic member 30 may be fixed to the outer surface 17 c of the engagement piece 17 so that the auxiliary elastic member 30 contacts the bottom surface 19 when the engagement piece 17 enters the engagement recess 18. .

  As the configuration of the auxiliary elastic member 30, in addition to the coil spring shown in this embodiment, a well-known spring member such as a plate spring or a disc spring can be adopted, and a material such as rubber having elasticity may be adopted.

Cross-sectional view of one embodiment The main part expanded sectional view which shows the effect | action of the same embodiment, (a) is an engagement state, (b) is an idling state. The principal part expansion perspective view which shows the detail of an inner side plate part and an outer side plate part Cross section of conventional example

Explanation of symbols

10, 20 One-way clutch 7 Pulleys 7a, 14d, 14f, 14g Inner diameter surface 8, 9 Seal portion 11 First bearing portion 12 Inner shaft 12a, 15d, 15f Outer diameter surface 13 Second bearing portion 14, 24 Input side member 14a , 14b Outer peripheral part 14c Outer plate part 14e, 15e, 24e, 25e Engagement surface 15, 25 Output side member 15a Recess 15a 'Bottom 15b Base part 15c Inner plate part 16, 26 Elastic member 16a, 16b Bounce part 16c Coil spring part 17 , 27 Engagement piece 17a Front end 17b Rear end 17c Outer side surface 17d Corner portion 18, 24a Engagement recess portion 18a Deep groove portion 18b End wall 18c Inclined portion 19 Bottom surface 30 Auxiliary elastic member 31 Storage hole

Claims (9)

Plate portions (14c, 15c) having engaging surfaces (14e, 15e) facing each other in the axial direction are provided on the outer member and the inner member arranged on the same axis, and the plate portions (14c, 15c). An engagement piece (17) is provided on one of the plates, and the engagement piece (17) is urged by the elastic member (16) from the one plate portion (15c) toward the other plate portion (14c), The engagement surface (14e) of the other plate portion (14c) is moved toward the other plate portion (14c) from the one plate portion (15c) by the biasing. An engagement recess (18) into which the engagement piece (17) can enter when the protrusion protrudes,
When the outer member and the inner member are relatively rotated in one direction around the axis, the outer piece and the inner member are engaged by the engagement piece (17) engaging with the engagement recess (18). When the outer member and the inner member are rotated relative to each other in the other direction around the axis, the engagement piece (17) is detached from the engagement recess (18) to release the engagement. And
An auxiliary elastic member (30) for urging the engagement piece (17) toward the one plate portion (15c) is provided between the engagement recess (18) and the engagement piece (17). A one-way clutch characterized by that.   The one-way clutch according to claim 1, wherein the auxiliary elastic member (30) is fixed in the engagement recess (18).   The auxiliary elastic member (30) is set so as not to hit the engagement piece (17) when the engagement piece (17) is detached from the engagement recess (18). The one-way clutch according to claim 2.   The said auxiliary | assistant elastic member (30) has an elastic force which does not make the said engagement piece (17) contact the bottom face (19) of the said engagement recessed part (18), The any one of Claim 1 thru | or 3 characterized by the above-mentioned. One-way clutch described in 1.   The one-way clutch according to any one of claims 1 to 4, wherein an elastic force of the auxiliary elastic member (30) is set smaller than an elastic force of the elastic member (16).   The one-way direction according to any one of claims 1 to 5, wherein the auxiliary elastic member (30) is housed in a housing hole (31) provided in the engagement recess (18). clutch.   The one-way clutch according to any one of claims 1 to 6, wherein the auxiliary elastic member (30) is a coil spring.   The one-way clutch according to any one of claims 1 to 6, wherein the auxiliary elastic member (30) is a leaf spring.   The outer member is a pulley (7), the inner member is an inner shaft (12), and the plate portion (14c) on the outer member side rises radially inward from the pulley (7). The said plate part (15c) by which the said inward member side is provided is provided so that it may stand up radially outward from the said inner shaft (12), The one of Claim 1 thru | or 8 characterized by the above-mentioned. One-way clutch built-in pulley unit incorporating a one-way clutch.

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